a) Precursors of tRNA and snRNA
b) Precursors of mRNA, snRNA and microRNA
c) Precursors of rRNA
d) All of the above
Answer: b) Precursors of mRNA, snRNA and microRNA
Explanation: Transcription in eukaryotes requires three polymerases and sets of transcription factors, unlike prokaryotes which requires a single RNA polymerase.
RNA polymerase 2 synthesises the nuclear pre-mRNAs, snRNA and microRNA.
RNA polymerase 1 synthesises the ribosomal RNAs, and polymerase 3 is responsible for the synthesis of tRNAs.
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